8-20Adjusting the carburetorThe carburetor should be checked and, if neces-sary, adjusted at the intervals specified in the peri-odic maintenance and lubrication chart. Thecarburetor is an important part of the engine andrequires very sophisticated adjustment. Therefore,most carburetor adjustments should be left to aYamaha dealer, who has the necessary profes-sional knowledge and experience. The adjustmentdescribed in the following section, however, maybe performed by the owner as part of routine main-tenance.NOTICEThe carburetor has been set and extensivelytested at the Yamaha factory. Changing thesesettings without sufficient technical knowl-edge may result in poor performance of ordamage to the engine.Adjusting the engine idling speedThe engine idling speed must be checked and, ifnecessary, adjusted as follows at the intervalsspecified in the periodic maintenance and lubrica-WARNINGPOTENTIAL HAZARDImproper cleaning of the spark arrester.Hot exhaust system.WHAT CAN HAPPENCould injure the eyes.Could cause burns.Could cause carbon monoxide poisoning,possibly leading to death.Could start a fire.HOW TO AVOID THE HAZARDWhen cleaning the spark arrester:Always let the exhaust system cool prior totouching exhaust components.Do not start the engine when cleaning the ex-haust system.8
